You might backup/restore the config using CLI commands as listed by rdan2 [in the link]; from PDF he posted the commands are:

backup image
Description: Store a backup copy of the flask disk image.
Syntax:
backup image password to location
password is the backup password for the device.
location must be a valid FTP or TFTP address.
Example:
backup image readwritefoo to ftp://joez:passwd1@100.100.100.3/myback.sysa-dl

restore
Description: Restore the device to a backup image or default configuration.
Syntax:
restore factory-default
Restores the device to its factory default configuration. No options available.
restore image password from location
password is the restore password of the device.
location is a valid FTP or TFTP address.
Example:
restore image configpasswordfoo from tftp://myftpsite/files/upload/april.fxi

So, as I understand you would proceed as below:
1. Create backup of your WG.
2. Reset the unit to factory defaults; so now you put your own passphrases for WG.
3. Load/restore the backed up image.

However am not sure if the passphrases would be retained when you restore the old configuration [IMO they should be set to as in old configuration]; it is worth a try though.

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